FT/P3-5 1 Load Assembly Design of the FAST Machine

The FAST [1][2] (Fusion Advanced Studies Torus) load assembly, which includes the Vacuum Vessel (VV) and its internal components, the magnet system and the poloidal field coils, is presented in this paper. FAST operates at a wide range [3][4] of parameters from high performance H-Mode (BT up to 8.5 T; IP up to 8 MA) as well as Advance Tokamak operation (IP=3 MA), and full non inductive current scenario (IP=2 MA). Helium gas at 30K is used for cooling the resistive copper magnets. That allows for a pulse duration up to 170 s ( ~ 40 times τres) at 3MA / 3.5T. To limit the TF magnet ripple within acceptable values ferromagnetic insert have been introduced inside the outboard area of the VV. The VV, segmented by 20 degree modules, is capable to accommodate 40 MW RF power systems. The machine has been designed to house10 MW Negative Neutral Beam injection (NNBI) systems. Tungsten (W) and Liquid Lithium (L-Li) have been chosen as the divertor plates material, and Argon as the injected impurities to mitigate the thermal loads. 1